A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the text. It shows the intention to find peace, which sets the stage for the rest of the paragraphs. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs do not qualify as the first sentence. For example, Paragraph 2 starts with 'I initially struggled,' which uses a pronoun and does not stand alone. Paragraph 3 starts with 'Eventually,' which is a transitional word. Paragraph 4 starts with 'Over time,' which also indicates a continuation of thought.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the main ideas of the text. It shows the final result of the journey and practice of meditation. This follows the Conclusive Words rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the story of the journey. It shows the struggle that comes after the intention to find peace. This follows the Logical Order rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows the result of the struggle. The effort mentioned in Paragraph 2 leads to the success in Paragraph 3. This follows the Cause and Effect Relationship rule.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains how the effort led to a change in life. It shows the transformation that happened over time. This follows the Broader to Specific Strategy.